/*!	 twirl.h
**	 Header file for implementation of the "Twirl" layer
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2008 Chris Moore
**	Copyright (c) 2012-2013 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifndef __SYNFIG_TWIRL_H
#define __SYNFIG_TWIRL_H

#include <synfig/layers/layer_composite_fork.h>
#include <synfig/color.h>
#include <synfig/vector.h>
#include <synfig/value.h>
#include <synfig/gradient.h>
#include <synfig/angle.h>

namespace synfig
{
namespace modules
{
namespace lyr_std
{

class Twirl_Trans;

class Twirl : public Layer_CompositeFork
{
    SYNFIG_LAYER_MODULE_EXT
    friend class Twirl_Trans;

private:
    // Parameter: (Point)
    ValueBase param_center;
    // Parameter: (Real)
    ValueBase param_radius;
    // Parameter: (Angle)
    ValueBase param_rotations;
    // Parameter: (bool)
    ValueBase param_distort_inside;
    // Parameter: (bool)
    ValueBase param_distort_outside;

    Point distort(const Point &pos, bool reverse = false)const;
public:

    Twirl();

    virtual bool set_param(const String & param, const ValueBase &value);

    virtual ValueBase get_param(const String & param)const;

    virtual Color get_color(Context context, const Point &pos)const;
    virtual CairoColor get_cairocolor(Context context, const Point &pos)const;

    // virtual bool accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const;

    Layer::Handle hit_check(Context context, const Point &point)const;

    virtual Vocab get_param_vocab()const;
    virtual etl::handle<Transform> get_transform()const;
    virtual bool reads_context()const
    {
        return true;
    }

protected:
    virtual RendDesc get_sub_renddesc_vfunc(const RendDesc &renddesc) const;
    virtual rendering::Task::Handle build_rendering_task_vfunc(Context context) const;
}; // END of class Twirl

}; // END of namespace lyr_std
}; // END of namespace modules
}; // END of namespace synfig

#endif